Annual report pursuant to Section 13 and 15(d)

Borrowings (Details 3)

v3.8.0.1
Borrowings (Details 3)
 4 Months Ended 12 Months Ended
Jun. 30, 2016
USD ($)
Apr. 16, 2017
USD ($)
Dec. 31, 2017
USD ($)
Dec. 25, 2016
USD ($)
Dec. 27, 2015
USD ($)
Apr. 13, 2017
Additional disclosure            
Loan origination costs     $ 2,400,000 $ 2,300,000    
Debt issuance costs     664,000 $ 1,058,000 $ 319,000  
New Credit Facility            
Additional disclosure            
Maximum borrowing capacity $ 20,000,000          
Additional borrowing capacity subject to lender participation 100,000,000          
New Credit Facility | Other assets, net            
Additional disclosure            
Loan origination costs     1,100,000      
New Credit Facility | Letters of Credit            
Additional disclosure            
Maximum borrowing capacity 25,000,000          
Amounts outstanding     7,600,000      
New Credit Facility | Revolving credit facility            
Additional disclosure            
Maximum borrowing capacity $ 400,000,000          
Amounts outstanding     $ 265,500,000      
New Credit Facility | Revolving credit facility | Federal Funds Rate            
Additional disclosure            
Interest rate margin (as a percent) 0.50%          
New Credit Facility | Revolving credit facility | LIBOR            
Additional disclosure            
Interest rate margin (as a percent) 1.00%          
New Credit Facility | Revolving credit facility | Canadian Dealer Offered Rate (CDOR)            
Additional disclosure            
Interest rate margin (as a percent) 1.00%          
New Credit Facility | Swingline Loans            
Additional disclosure            
Maximum borrowing capacity $ 15,000,000          
Revolving credit facility | New Credit Facility Amendment            
Additional disclosure            
Additional pricing tiers, lease adjusted leverage ratio           4.75
Debt issuance costs   $ 700,000        
Revolving credit facility | Through October 1, 2017 | New Credit Facility Amendment            
Additional disclosure            
Covenant compliance, lease adjusted leverage ratio           5.25
Revolving credit facility | October 2, 2017 Through July 15, 2018 | New Credit Facility Amendment            
Additional disclosure            
Covenant compliance, lease adjusted leverage ratio           5.0
Revolving credit facility | July 16, 2018 And Thereafter | New Credit Facility Amendment            
Additional disclosure            
Covenant compliance, lease adjusted leverage ratio           4.75